A tabletop the shape of a trapezoid has an area of 5,290 square centimeters . Its longer base measures 119 centimeters , and the shorter base 65 centimeters . What is the helght ? The height of the tabletop is centimeters .

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)